bbbb bbbs bblb bbls bibb bibi bibl bibs biis bili bill bils bily birb biri birl birr birs biry bis- bisl biss bisy biys blir blis blls blss bly- blys bril bris brls brrr brrs brsb brsr bry- byil bysb bysi bysl byss bysy i-by ibis ibly ibri ibss ibyi iiii iiis iirs iisi iisr ilir ilis ill- illi ills illy irby iri- iril iris iriy irlb irri irrs isbl isil isis isls isly isri issi issr isss issy isyl isys lblr lbrs libr libs liii liir liis lilb lili lill lils lily liri lirl lirr lirs liry lisi liss lisy liyl llbs llll llyr lrrr lrry ls-r lssr lyly lys- lysi lysl lyss rbbb rbbr rbbs rbis rbsl rbss rib- ribs riby riis rill rily riri rirs risi riss rlls rlys rrrr rsbi rsis rssl ryis rysy s-ib s-ii sbbs sbsi sibi sibs siby sil- sili sill sils siri sirr sirs sisi siss sisy siyi sl-i slib slir slrs slys srby srib sris ssbr ssby ssis ssri ssrl ssrs sssb sssi ssss syis syl- syli syll syls syrs syry syss ybbs ybry yili yill yirb yirr yiss ylli ylls yrly ysby ysii ysyb yyyy